Looking back in your notes is fine. But when you go to answer the question, don't copy/rewrite exactly from your notes. Take a look, think about it, then write it from the top of your head. This helps with developing better recall.
Also, you might want to mark the questions you can't do straight away and make them priorities when you continue to revise.
What one of my teachers gets me to do is do a past paper cold (no notes or anything). Then, mark the paper and see what questions I got wrong. Write down the topics they were from. These are now your known unknowns, and a priority to learn.
